SAHF - Store AH Register into FLAGS

        Usage:  SAHF
        Modifies flags: AF CF PF SF ZF

        Transfers bits 0-7 of AH into the Flags Register.  This includes
        AF, CF, PF, SF and ZF.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              4     2     3     2             1

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